CN112228655A - Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator - Google Patents

Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator Download PDF

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Publication number
CN112228655A
CN112228655A CN202010942339.9A CN202010942339A CN112228655A CN 112228655 A CN112228655 A CN 112228655A CN 202010942339 A CN202010942339 A CN 202010942339A CN 112228655 A CN112228655 A CN 112228655A
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CN
China
Prior art keywords
sealing ring
lip
ring
pole shoe
shaped
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CN202010942339.9A
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Chinese (zh)
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CN112228655B (en
Inventor
陈嘉伟
戴德庆
钟正虎
赵向飞
张�林
于洋
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Beijing Aerospace Wanhong High Technology Co ltd
Beijing Aerospace Control Instrument Institute
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Beijing Aerospace Wanhong High Technology Co ltd
Beijing Aerospace Control Instrument Institute
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Priority to CN202010942339.9A priority Critical patent/CN112228655B/en
Publication of CN112228655A publication Critical patent/CN112228655A/en
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Publication of CN112228655B publication Critical patent/CN112228655B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
    • F16L27/087—Joints with radial fluid passages
    • F16L27/093—Joints with radial fluid passages of the "banjo" type, i.e. pivoting right-angle couplings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324—Arrangements for lubrication or cooling of the sealing itself
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force

Abstract

The utility model provides a revolving stage refrigeration incubator rotary joint magnetic liquid sealing device, belongs to the sealed field of mechanical engineering, solves the poor, easy problem of leaking of current revolving stage incubator refrigeration rotary joint sealing washer low temperature ability. The magnetic liquid directly contacts with refrigeration media such as Freon and R404A/R23 confluence agents to prevent leakage, the second lip-shaped sealing ring, the third lip-shaped sealing ring, the fourth lip-shaped sealing ring and the fifth lip-shaped sealing ring further prevent the leakage of the refrigeration media when the magnetic liquid is broken, and also can prevent the leakage of invalid magnetic liquid, thereby being beneficial to the self-recovery of the magnetic liquid seal, the first magnetic conduction plate, the first pressing plate, the second pressing plate, the third pressing plate, the second magnetic conduction plate and the rotating shaft form labyrinth seal to improve the sealing performance, solving the leakage problem of volatile refrigeration media such as Freon and R404A/R23 confluence agents, having good low-temperature performance and long service life, and expanding the application range of the magnetic liquid seal.

Description

Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator
Technical Field
The invention relates to a magnetic liquid sealing device for a rotary joint of a rotary table refrigeration incubator, belonging to the field of mechanical engineering sealing.
Background
For the turntable testing device, when simulation has special requirements on the environmental temperature, a temperature box needs to be installed on the turntable. Generally, the incubator body rotates together with the turntable, and the rotary motion and the incubator refrigeration are ensured by the rotary joint. The incubator generally adopts refrigerants such as Freon, R404A/R23 mixing agent and the like as refrigeration media, has the characteristics of volatility, low boiling point and the like, and the refrigeration effect can be influenced by leakage. Most rotary joints are sealed by sealing rings, and are easy to generate hard elasticity loss to cause leakage in a low-temperature environment, and have the problems of easy abrasion, short service life and the like. The magnetic liquid seal is widely applied to the field of sealing due to the advantages of zero leakage, long service life, low friction and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a magnetic liquid sealing device for a rotary joint of a rotary table refrigeration incubator, which solves the problem of leakage of volatile refrigeration media such as Freon, R404A/R23 blending agent and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rotary joint magnetic liquid sealing device of a rotary table refrigeration incubator comprises: the magnetic bearing comprises a front end cover, a shell, a first bearing, a first magnetism isolating ring, a first sealing assembly, magnetic liquid, a second magnetism isolating ring, a second sealing assembly, a third magnetism isolating ring, a third sealing assembly, a fourth magnetism isolating ring, a second bearing, a rear end cover, a rotating shaft, an air inlet joint sealing ring, an air inlet joint, an air outlet joint sealing ring and an air outlet joint;
the first sealing assembly, the second magnetism isolating ring, the second sealing assembly, the third magnetism isolating ring and the third sealing assembly are sequentially arranged on the rotating shaft, and magnetic liquid is injected to form a sealing structure; the sealing structure is arranged in the shell and rotates to enable the through holes of the second magnetism isolating ring and the third magnetism isolating ring to be aligned with the through holes in the shell; the first magnetism isolating ring, the first bearing and the front end cover are sequentially arranged in the shell from the left end of the shell, the fourth magnetism isolating ring, the second bearing and the rear end cover are sequentially arranged in the shell from the right end of the shell, and the positioning is completed by utilizing the threaded connection of the front end cover, the shell and the rear end cover; the air inlet joint sealing ring, the air inlet joint, the air outlet joint sealing ring and the air outlet joint are installed on the through hole on the shell in a threaded connection mode;
the sealing device utilizes the magnetic liquid seal, the lip seal and the labyrinth seal which are formed by the first sealing component, the second sealing component, the third sealing component and the rotating shaft when in work.
Furthermore, an air inlet through hole is formed in the third magnetism isolating ring, and an air inlet joint, the air inlet through hole in the third magnetism isolating ring and an air inlet hole path arranged in the rotating shaft are communicated to form an air inlet path together;
the second magnetism isolating ring is provided with an air outlet through hole, and the air outlet joint, the air outlet through hole on the second magnetism isolating ring and an air outlet hole path arranged in the rotating shaft are communicated to jointly form an air outlet path.
Further, the first sealing assembly comprises a first sealing ring, a first magnetic conduction plate, a first lip-shaped sealing ring, a first pressing plate, a first permanent magnet, a second lip-shaped sealing ring, a second sealing ring and a first pole shoe;
the first sealing ring is arranged in the groove of the first magnetic conduction plate to form the first magnetic conduction plate with the sealing ring; the second sealing ring is arranged in the groove of the first pole shoe to form the first pole shoe with the sealing ring; the N pole of the first permanent magnet is arranged in the end surface groove of the first magnetic conduction plate with the sealing ring, the S pole of the first permanent magnet is arranged in the end surface groove of the first pole shoe with the sealing ring, the end surface of the first lip-shaped sealing ring without the groove is arranged to be attached to the end surface of the first magnetic conduction plate, and the outer diameter circle of the first lip-shaped sealing ring is contacted with the inner diameter circle of the first permanent magnet; the end face of the second lip-shaped sealing ring without the groove is tightly attached to the end face of the first pole shoe, and the outer diameter circle of the second lip-shaped sealing ring is in contact with the inner diameter circle of the first permanent magnet; the first pressure plate is located between the first lip-shaped sealing ring and the second lip-shaped sealing ring, the outer diameter circle of the first pressure plate is in contact with the inner diameter circle of the first permanent magnet, and the first pressure plate tightly presses the first lip-shaped sealing ring and the second lip-shaped sealing ring.
Further, the second sealing assembly comprises a third sealing ring, a second pole shoe, a third lip-shaped sealing ring, a second pressure plate, a second permanent magnet, a fourth lip-shaped sealing ring, a fourth sealing ring and a third pole shoe;
the third sealing ring is arranged in the groove of the second pole shoe to form the second pole shoe with the sealing ring; the fourth sealing ring is arranged in a groove of the third pole shoe to form the third pole shoe with the sealing ring; the N pole of the second permanent magnet is arranged in an end surface groove of the second pole shoe with the sealing ring, the S pole of the second permanent magnet is arranged in an end surface groove of the third pole shoe with the sealing ring, the end surface of the third lip-shaped sealing ring without the groove is tightly attached to the end surface of the second pole shoe, and the outer diameter circle of the third lip-shaped sealing ring is in contact with the inner diameter circle of the second permanent magnet; the end face of the fourth lip-shaped sealing ring without a groove is tightly attached to the end face of the third pole shoe, and the outer diameter circle of the fourth lip-shaped sealing ring is in contact with the inner diameter circle of the second permanent magnet; the second pressure plate is located between the third lip-shaped sealing ring and the fourth lip-shaped sealing ring, the outer diameter circle of the second pressure plate is in contact with the inner diameter circle of the second permanent magnet, and the third lip-shaped sealing ring and the fourth lip-shaped sealing ring are tightly pressed by the second pressure plate.
Further, the third sealing assembly comprises a fifth sealing ring, a fourth pole shoe, a fifth lip-shaped sealing ring, a third pressure plate, a third permanent magnet, a sixth lip-shaped sealing ring, a sixth sealing ring and a second magnetic conduction plate;
the fifth sealing ring is arranged in a groove of the fourth pole shoe to form the fourth pole shoe with the sealing ring; the sixth sealing ring is arranged in the groove of the second magnetic conduction plate to form the second magnetic conduction plate with the sealing ring; the N pole of the third permanent magnet is arranged in a groove on the end face of the fourth pole shoe with the sealing ring, and the S pole of the third permanent magnet is arranged in a groove on the end face of the second magnetic conduction plate with the sealing ring;
the end face of the fifth lip-shaped sealing ring without a groove is tightly attached to the end face of the fourth pole shoe, and the outer diameter circle of the fifth lip-shaped sealing ring is in contact with the inner diameter circle of the third permanent magnet; the end face of the sixth lip-shaped sealing ring without a groove is tightly attached to the end face of the second magnetic conduction plate, and the outer diameter circle of the sixth lip-shaped sealing ring is in contact with the inner diameter circle of the third permanent magnet;
the third pressure plate is located between the fifth lip-shaped sealing ring and the sixth lip-shaped sealing ring, the outer diameter circle of the third pressure plate is in contact with the inner diameter circle of the third permanent magnet, and the fifth lip-shaped sealing ring and the sixth lip-shaped sealing ring are tightly pressed by the third pressure plate.
Furthermore, the near shaft ends of the first magnetic conduction plate and the second magnetic conduction plate are processed into high and low tooth shapes, the gap a between the tooth top of the low tooth and the rotating shaft is 0.2-0.4 mm, and the gap b between the tooth top of the high tooth and the rotating shaft is 0.1-0.2 mm.
Further, the near shaft ends of the first pressing plate, the second pressing plate and the third pressing plate are processed into teeth, and the clearance c between the tooth tops and the rotating shaft is 0.2-0.3 mm;
and one sides of the first lip-shaped sealing ring, the second lip-shaped sealing ring, the third lip-shaped sealing ring, the fourth lip-shaped sealing ring, the fifth lip-shaped sealing ring and the sixth lip-shaped sealing ring, which face the pressure plate, are provided with inclined grooves, and the included angle alpha between each inclined groove and the horizontal plane is 30-45 degrees.
Furthermore, the proximal shaft ends of the first pole shoe, the second pole shoe, the third pole shoe and the fourth pole shoe are processed into teeth, a sealing gap exists between the tooth-shaped structure and the rotating shaft, and the magnetic liquid is injected into the sealing gap.
Furthermore, a magnetic circuit formed by the first magnetic conduction plate, the first permanent magnet, the first pole shoe and the rotating shaft, a magnetic circuit formed by the second pole shoe, the second permanent magnet, the third pole shoe and the rotating shaft, and a magnetic circuit formed by the fourth pole shoe, the third permanent magnet, the second magnetic conduction plate and the rotating shaft are utilized to keep the magnetic liquid in a sealing gap to form magnetic liquid seal; the tooth-shaped structures of each magnetic conduction plate and each pressure plate and the rotating shaft form labyrinth seal; each lip-shaped sealing ring and the rotating shaft form a lip-shaped seal.
Furthermore, the inclined groove on the lip-shaped sealing ring is used for collecting the magnetic liquid which is thrown out of the sealing gap due to the centrifugal force formed by the rapid rotation of the rotating shaft, so that the magnetic liquid returns to the sealing gap.
Compared with the prior art, the invention has the following beneficial effects:
(1) the magnetic liquid seal can realize zero leakage at low temperature, and is directly contacted with refrigerating media such as Freon, R404A/R23 mixing agent and the like, so that the problem of low-temperature leakage of the rotary joint of the rotary table incubator is solved;
(2) under special conditions, if the magnetic liquid seal fails, the lip-shaped seal ring can further prevent the leakage of refrigerating media such as Freon, R404A/R23 mixing agent and the like, and also can prevent the leakage of the failed magnetic liquid, thereby being beneficial to the self-recovery of the magnetic liquid seal and enhancing the sealing performance;
(3) the magnetic liquid has lubricating property and can slow down the abrasion of the lip-shaped sealing ring;
(4) the tooth-shaped structures of the magnetic conduction plate and the pressure plate and the rotating shaft form labyrinth seal, so that the sealing performance is further enhanced, the leakage rate is reduced, and the sealing performance of the rotary joint of the rotary table refrigeration incubator is improved.
(5) The inclined groove on the lip-shaped sealing ring is used for collecting the magnetic liquid which is thrown out of the sealing gap due to the centrifugal force formed by the rapid rotation of the rotating shaft, so that the magnetic liquid returns to the sealing gap.
Drawings
FIG. 1 is a magnetic liquid sealing device for a rotary joint of a turntable refrigeration incubator;
FIG. 2 is a schematic view of a first seal assembly;
FIG. 3 is a schematic view of a second seal assembly;
FIG. 4 is a schematic view of a third seal assembly;
FIG. 5 illustrates a lip seal and pressure plate configuration and installation;
FIG. 6 is a schematic diagram of the magnetic fluid seal self-recovery and magnetic circuit.
Detailed Description
The invention is further illustrated by the following detailed description:
the invention provides a magnetic liquid sealing device for a rotary joint of a rotary table refrigeration incubator, the general structure of which is shown in figure 1, and the sealing device comprises: the magnetic bearing comprises a front end cover 1, a shell 2, a first bearing 3, a first magnetism isolating ring 4, a first sealing assembly 5, magnetic liquid 6, a second magnetism isolating ring 7, a second sealing assembly 8, a third magnetism isolating ring 9, a third sealing assembly 10, a fourth magnetism isolating ring 11, a second bearing 12, a rear end cover 13, a rotating shaft 14, an air inlet joint sealing ring 15, an air inlet joint 16, an air outlet joint sealing ring 17 and an air outlet joint 18.
The connection between each part of the device is formed as follows:
the first sealing assembly 5, the second magnetism isolating ring 7, the second sealing assembly 8, the third magnetism isolating ring 9 and the third sealing assembly 10 are sequentially installed on the rotating shaft 14 together, and magnetic liquid 6 is injected to form a sealing part; during initial installation, the through holes of the second magnetism isolating ring 7 and the third magnetism isolating ring 9 are aligned with the hole on the rotating shaft 14 through rotation;
the sealing part is arranged in the shell 2, the sealing part rotates to enable the through holes of the second magnetism isolating ring 7 and the third magnetism isolating ring 9 to be aligned with the through holes on the shell 2, then when the sealing part works, the middle rotating shaft 14 rotates, other parts are not moved, and a gap is formed between the magnetism isolating ring and the rotating shaft to form a cavity, so that a gas passage is always formed in the rotating process of the rotating shaft;
the first magnetism isolating ring 4, the first bearing 3 and the front end cover 1 are sequentially arranged in the shell 2 from the left end of the shell 2, the fourth magnetism isolating ring 11, the second bearing 12 and the rear end cover 13 are sequentially arranged in the shell 2 from the right end of the shell 2, and the positioning is completed by utilizing the threaded connection of the front end cover 1, the shell 2 and the rear end cover 13; the air inlet joint sealing ring 15, the air inlet joint 16, the air outlet joint sealing ring 17 and the air outlet joint 18 are installed on the through hole of the shell 2 in a threaded connection mode;
the device works by utilizing the magnetic liquid seal, the lip seal and the labyrinth seal formed by the first seal assembly 5, the second seal assembly 8 and the third seal assembly 10 and the rotating shaft 14 to play a sealing role.
The air inlet joint sealing ring 15 and the air outlet joint sealing ring 17 are used for static sealing at the joint of the air inlet joint 16, the air outlet joint 18 and the shell 2.
An air inlet through hole is formed in the third magnetism isolating ring 9, and an air inlet joint 16, the air inlet through hole in the third magnetism isolating ring 9 and an air inlet hole path arranged in the rotating shaft 14 are communicated to form an air inlet path together;
the second magnetism isolating ring 7 is provided with an air outlet through hole, and the air outlet joint 18, the air outlet through hole on the second magnetism isolating ring 7 and an air outlet hole path arranged in the rotating shaft 14 are communicated to jointly form an air outlet path.
As shown in fig. 2, the first seal assembly 5 specifically includes a first seal ring 501, a first magnetic conductive plate 502, a first lip-shaped seal ring 503, a first pressure plate 504, a first permanent magnet 505, a second lip-shaped seal ring 506, a second seal ring 507, and a first pole shoe 508;
the first sealing ring 501 is arranged in a groove of the first magnetic conduction plate 502 to form a first magnetic conduction plate with a sealing ring; the second sealing ring 507 is arranged in a groove of the first pole shoe 508 to form the first pole shoe with the sealing ring; the N pole of the left end face of the first permanent magnet 505 is arranged in a groove of the right end face of the first magnetic conduction plate with the sealing ring, the S pole of the right end face of the first permanent magnet 505 is arranged in a groove of the left end face of the first pole shoe with the sealing ring, the end face of the first lip-shaped sealing ring 503 without a groove is arranged in a manner of clinging to the right end face of the first magnetic conduction plate 502, and the outer diameter circle of the first lip-shaped sealing ring 503 is in circular contact with the inner diameter circle of. The end face of the second lip-shaped seal ring 506 without a groove is installed on the left end face of the first pole shoe 508, and the outer diameter circle of the second lip-shaped seal ring 506 is in contact with the inner diameter circle of the first permanent magnet 505, so that a first seal assembly 5 is formed.
The first pressure plate 504 is located between the first lip seal 503 and the second lip seal 506, the outer diameter circle of the first pressure plate 504 is in contact with the inner diameter circle of the first permanent magnet 505, and the first pressure plate 504 presses the first lip seal 503 and the second lip seal 506.
As shown in fig. 3, the specific structure of the second sealing assembly 8 includes: a third seal ring 801, a second pole shoe 802, a third lip-shaped seal ring 803, a second pressure plate 804, a second permanent magnet 805, a fourth lip-shaped seal ring 806, a fourth seal ring 807 and a third pole shoe 808;
the third sealing ring 801 is arranged in a groove of the second pole shoe 802 to form the second pole shoe with the sealing ring; the fourth sealing ring 807 is arranged in a groove of the third pole shoe 808 to form the third pole shoe with the sealing ring; the N pole on the left end face of the second permanent magnet 805 is installed in a groove on the right end face of the second pole shoe with a sealing ring, the S pole on the right end face of the second permanent magnet 805 is installed in a groove on the left end face of the third pole shoe with a sealing ring, the end face of the third lip-shaped sealing ring 803 without a groove is installed on the right end face of the second pole shoe 802, and the outer diameter circle of the third lip-shaped sealing ring 803 is in contact with the inner diameter circle of the second permanent magnet 805. The end face of the fourth lip-shaped sealing ring 807 without a groove is arranged on the left end face of the third pole shoe 808, and the outer diameter circle of the fourth lip-shaped sealing ring 807 is in contact with the inner diameter circle of the second permanent magnet 805, so that a second sealing assembly 8 is formed.
The second presser plate 804 is located between the third lip seal 803 and the fourth lip seal 807, the outer diameter circle of the second presser plate 804 is in contact with the inner diameter circle of the second permanent magnet 805, and the second presser plate 804 presses the third lip seal 803 and the fourth lip seal 807.
As shown in fig. 4, the specific structure of the third seal assembly 10 includes: a fifth seal ring 1001, a fourth pole shoe 1002, a fifth lip seal ring 1003, a third pressure plate 1004, a third permanent magnet 1005, a sixth lip seal ring 1006, a sixth seal ring 1007, and a second magnetic conduction plate 1008;
the fifth sealing ring 1003 is arranged in a groove of the fourth pole shoe 1002 to form a fourth pole shoe with a sealing ring; the sixth sealing ring 1007 is mounted in a groove of the second magnetic conduction plate 1008 to form a second magnetic conduction plate with a sealing ring; the N pole of the left end face of the third permanent magnet 1005 is arranged in a groove of the right end face of the fourth pole shoe with the sealing ring, the S pole of the right end face of the third permanent magnet 1005 is arranged in a groove of the left end face of the second magnetic conducting plate with the sealing ring, the end face of the fifth lip-shaped sealing ring 1003 without a groove is arranged on the right end face of the fourth pole shoe 1002, and the outer diameter circle of the fifth lip-shaped sealing ring 1003 is in contact with the inner diameter circle of the third permanent magnet 1005. The end face of the sixth lip-shaped seal ring 1006 without a groove is mounted on the left end face of the second magnetic conduction plate 1008, and the outer diameter circle of the sixth lip-shaped seal ring 1006 contacts with the inner diameter circle of the third permanent magnet 1005, so as to form the third seal assembly 10.
A third pressure plate 1004 is located between the fifth lip seal 1003 and the sixth lip seal 1006, an outer diameter circle of the third pressure plate 1004 is in contact with an inner diameter circle of the third permanent magnet 1005, and the third pressure plate 1004 presses the fifth lip seal 1003 and the sixth lip seal 1006.
When the sealing device works, a magnetic circuit formed by the first magnetic conduction plate 502, the first permanent magnet 505, the first pole shoe 508 and the rotating shaft 14, a magnetic circuit formed by the second pole shoe 802, the second permanent magnet 805, the third pole shoe 808 and the rotating shaft 14, and a magnetic circuit formed by the fourth pole shoe 1002, the third permanent magnet 1005, the second magnetic conduction plate 1008 and the rotating shaft 14 are utilized, so that the magnetic liquid 6 is kept in a sealing gap to play a sealing role; the tooth-shaped structures of each magnetic conduction plate and each pressure plate and the rotating shaft 14 form a labyrinth seal to play a role in sealing; each lip seal forms a lip seal with the shaft 14 for sealing purposes.
In the invention, the near shaft ends of the first magnetic conduction plate 502 and the second magnetic conduction plate 1008 are processed into high and low tooth shapes, the clearance a between the tooth tops of the low teeth and the rotating shaft 14 is 0.2-0.4 mm, and the clearance b between the tooth tops of the high teeth and the rotating shaft is 0.1-0.2 mm; the near shaft ends of the first pressing plate 504, the second pressing plate 804 and the third pressing plate 1004 are processed into teeth, and the clearance c between the tooth tops and the rotating shaft 14 is 0.2-0.3 mm; the lower end face sides of the first lip-shaped sealing ring 503, the second lip-shaped sealing ring 506, the third lip-shaped sealing ring 803, the fourth lip-shaped sealing ring 806, the fifth lip-shaped sealing ring 1003 and the sixth lip-shaped sealing ring 1006 are provided with inclined grooves, and the included angle alpha between the grooves and the horizontal is 30-45 degrees.
The structure of the present invention is described by taking the third sealing assembly 10 as an example, as shown in fig. 5: the near shaft end of the second magnetic conduction plate 1008 is processed into a high-low tooth shape, the gap a between the tooth top of the low tooth and the rotating shaft 14 is 0.2-0.4 mm, the gap b between the tooth top of the high tooth and the rotating shaft 14 is 0.1-0.2 mm, and the high-low tooth and the rotating shaft 14 form labyrinth seal; the shaft end near the third pressing plate 1004 is processed into a tooth shape, the clearance c between the tooth top and the rotating shaft 14 is 0.2-0.3 mm, and a labyrinth seal is formed between the tooth top and the rotating shaft 14; the lower end face sides of the fifth lip-shaped sealing ring 1003 and the sixth lip-shaped sealing ring 1006 are provided with inclined grooves, the included angle alpha between each groove and the horizontal plane is 30-45 degrees, the grooves can be used for collecting part of magnetic liquid thrown out of a sealing gap due to centrifugal force formed by rapid rotation, and the lip-shaped sealing rings and the rotating shaft 14 form lip-shaped sealing.
The invention is illustrated by taking the first sealing assembly 5 as an example of the sealing principle, as shown in fig. 6: a magnetic circuit formed by the first magnetic conduction plate 502, the first permanent magnet 505, the first pole shoe 508 and the rotating shaft 14 keeps the magnetic liquid 6 in a sealed gap; if the pressure on the side of the sealed cavity is suddenly increased, the magnetic liquid 6 may be burst through, at this time, the second lip-shaped sealing ring 506 plays a sealing role, so that the leakage of refrigerating media such as Freon, R404A/R23 mixture and the like can be prevented, the leakage of the magnetic liquid 6 can also be prevented, and the leaked magnetic liquid can return to a sealing gap formed by the first pole shoe 508 and the rotating shaft 14 under the action of a magnetic field gradient, so that the sealed self-repairing effect of the magnetic liquid is achieved; the magnetic liquid 6 has a lubricating effect and can slow down the abrasion of the second lip-shaped sealing ring 506; if the rotating speed of the rotating shaft 14 is too high, the magnetic liquid 6 may be thrown out of the sealing gap, and the groove structure of the second lip-shaped sealing ring 506 collects the thrown magnetic liquid to enable the magnetic liquid to return to the sealing gap again, so that the capacity of the sealing device for coping with special conditions is improved; the high-low teeth of the first magnetic conduction plate 502 and the rotating shaft 14 form a labyrinth seal, and the tooth-shaped structure of the first pressure plate 504 and the rotating shaft 14 form a labyrinth seal, so that the sealing performance is further improved.
In the embodiment of the invention, through holes for connecting the inner circle and the outer circle are formed on the second magnetism isolating ring 7 and the third magnetism isolating ring 9;
the pole shoe and the rotating shaft 14 are made of materials with good magnetic permeability, such as electrician pure iron;
the permanent magnet is neodymium iron boron;
the front end cover 1, the shell 2, the rear end cover 13, the magnetism isolating ring and the pressing plate are made of non-magnetic conducting materials such as stainless steel;
the kind of the magnetic liquid 6 is selected according to the environment and the sealing medium.
The magnetic liquid seal can realize zero leakage at low temperature, and can directly contact with refrigerating media such as Freon, R404A/R23 mixture and the like, thereby solving the problem of low-temperature leakage of the rotary joint of the rotary table incubator. When the magnetic liquid is broken, the second lip-shaped sealing ring, the third lip-shaped sealing ring, the fourth lip-shaped sealing ring and the fifth lip-shaped sealing ring further prevent the leakage of the refrigerating medium and the magnetic liquid which fails, and are beneficial to the self-recovery of the magnetic liquid sealing. The first magnetic conduction plate, the first pressing plate, the second pressing plate, the third pressing plate, the second magnetic conduction plate and the rotating shaft form a labyrinth seal to improve the sealing performance, the problem of leakage of volatile refrigeration media such as Freon, R404A/R23 mixing agent and the like is solved, the low-temperature performance is good, the service life is long, and the application range of magnetic liquid seal is expanded.

Claims (10)

1. The utility model provides a revolving stage refrigeration incubator rotary joint magnetic liquid sealing device which characterized in that includes: the magnetic bearing comprises a front end cover (1), a shell (2), a first bearing (3), a first magnetism isolating ring (4), a first sealing assembly (5), magnetic liquid (6), a second magnetism isolating ring (7), a second sealing assembly (8), a third magnetism isolating ring (9), a third sealing assembly (10), a fourth magnetism isolating ring (11), a second bearing (12), a rear end cover (13), a rotating shaft (14), an air inlet joint sealing ring (15), an air inlet joint (16), an air outlet joint sealing ring (17) and an air outlet joint (18);
the first sealing assembly (5), the second magnetism isolating ring (7), the second sealing assembly (8), the third magnetism isolating ring (9) and the third sealing assembly (10) are sequentially arranged on the rotating shaft (14), and magnetic liquid (6) is injected to form a sealing structure; the sealing structure is arranged in the shell (2) and rotates to enable the through holes of the second magnetism isolating ring (7) and the third magnetism isolating ring (9) to be aligned with the through hole in the shell (2); the first magnetism isolating ring (4), the first bearing (3) and the front end cover (1) are sequentially arranged in the shell (2) from the left end of the shell (2), the fourth magnetism isolating ring (11), the second bearing (12) and the rear end cover (13) are sequentially arranged in the shell (2) from the right end of the shell (2), and the front end cover (1), the shell (2) and the rear end cover (13) are connected through threads to complete positioning; the air inlet joint sealing ring (15), the air inlet joint (16), the air outlet joint sealing ring (17) and the air outlet joint (18) are installed on a through hole in the shell (2) in a threaded connection mode;
the sealing device works by utilizing a magnetic liquid seal, a lip seal and a labyrinth seal which are formed by the first sealing assembly (5), the second sealing assembly (8), the third sealing assembly (10) and the rotating shaft (14).
2. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 1, wherein: an air inlet through hole is formed in the third magnetism isolating ring (9), and an air inlet joint (16), the air inlet through hole in the third magnetism isolating ring (9) and an air inlet hole path arranged in the rotating shaft (14) are communicated to form an air inlet path together;
an air outlet through hole is formed in the second magnetism isolating ring (7), and an air outlet joint (18), the air outlet through hole in the second magnetism isolating ring (7) and an air outlet hole path arranged in the rotating shaft (14) are communicated to form an air outlet path together.
3. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 1, wherein: the first sealing assembly (5) comprises a first sealing ring (501), a first magnetic conduction plate (502), a first lip-shaped sealing ring (503), a first pressure plate (504), a first permanent magnet (505), a second lip-shaped sealing ring (506), a second sealing ring (507) and a first pole shoe (508);
the first sealing ring (501) is arranged in a groove of the first magnetic conduction plate (502) to form the first magnetic conduction plate with the sealing ring; the second sealing ring (507) is arranged in a groove of the first pole shoe (508) to form the first pole shoe with the sealing ring; the N pole of the first permanent magnet (505) is arranged in the end face groove of the first magnetic conduction plate with the sealing ring, the S pole of the first permanent magnet (505) is arranged in the end face groove of the first pole shoe with the sealing ring, the end face of the first lip-shaped sealing ring (503) without a groove is tightly attached to the end face of the first magnetic conduction plate (502), and the outer diameter circle of the first lip-shaped sealing ring (503) is in contact with the inner diameter circle of the first permanent magnet (505); the end face of the second lip-shaped sealing ring (506) without a groove is tightly attached to the end face of the first pole shoe (508), and the outer diameter circle of the second lip-shaped sealing ring (506) is in contact with the inner diameter circle of the first permanent magnet (505); the first pressure plate (504) is located between the first lip-shaped sealing ring (503) and the second lip-shaped sealing ring (506), the outer diameter circle of the first pressure plate (504) is in contact with the inner diameter circle of the first permanent magnet (505), and the first pressure plate (504) presses the first lip-shaped sealing ring (503) and the second lip-shaped sealing ring (506).
4. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 3, wherein:
the second sealing assembly (8) comprises a third sealing ring (801), a second pole shoe (802), a third lip-shaped sealing ring (803), a second pressure plate (804), a second permanent magnet (805), a fourth lip-shaped sealing ring (806), a fourth sealing ring (807) and a third pole shoe (808);
the third sealing ring (801) is arranged in a groove of the second pole shoe (802) to form the second pole shoe with the sealing ring; the fourth sealing ring (807) is arranged in a groove of the third pole shoe (808) to form the third pole shoe with the sealing ring; the N pole of the second permanent magnet (805) is arranged in an end face groove of the second pole shoe with the sealing ring, the S pole of the second permanent magnet (805) is arranged in an end face groove of the third pole shoe with the sealing ring, the end face of the third lip-shaped sealing ring (803) without a groove is tightly attached to the end face of the second pole shoe (802), and the outer diameter circle of the third lip-shaped sealing ring (803) is in contact with the inner diameter circle of the second permanent magnet (805); the end face of a fourth lip-shaped sealing ring (807) without a groove is tightly attached to the end face of a third pole shoe (808), and the outer diameter circle of the fourth lip-shaped sealing ring (807) is in contact with the inner diameter circle of a second permanent magnet (805); the second pressure plate (804) is located between the third lip-shaped sealing ring (803) and the fourth lip-shaped sealing ring (807), the outer diameter circle of the second pressure plate (804) is in contact with the inner diameter circle of the second permanent magnet (805), and the third lip-shaped sealing ring (803) and the fourth lip-shaped sealing ring (807) are pressed tightly by the second pressure plate (804).
5. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 4, wherein: the third sealing assembly (10) comprises a fifth sealing ring (1001), a fourth pole shoe (1002), a fifth lip-shaped sealing ring (1003), a third pressure plate (1004), a third permanent magnet (1005), a sixth lip-shaped sealing ring (1006), a sixth sealing ring (1007) and a second magnetic conduction plate (1008);
the fifth sealing ring (1001) is arranged in a groove of the fourth pole shoe (1002) to form the fourth pole shoe with the sealing ring; the sixth sealing ring (1007) is arranged in a groove of the second magnetic conduction plate (1008) to form the second magnetic conduction plate with the sealing ring; the N pole of the third permanent magnet (1005) is arranged in the end surface groove of the fourth pole shoe with the sealing ring, and the S pole of the third permanent magnet (1005) is arranged in the end surface groove of the second magnetic conduction plate with the sealing ring;
the end face of the fifth lip-shaped sealing ring (1003) without a groove is tightly attached to the end face of the fourth pole shoe (1002), and the outer diameter circle of the fifth lip-shaped sealing ring (1003) is in contact with the inner diameter circle of the third permanent magnet (1005); the end face of the sixth lip-shaped sealing ring (1006) without a groove is tightly attached to the end face of the second magnetic conduction plate (1008), and the outer diameter circle of the sixth lip-shaped sealing ring (1006) is in contact with the inner diameter circle of the third permanent magnet (1005);
the third pressure plate (1004) is positioned between the fifth lip-shaped seal ring (1003) and the sixth lip-shaped seal ring (1006), the outer diameter circle of the third pressure plate (1004) is in contact with the inner diameter circle of the third permanent magnet (1005), and the fifth lip-shaped seal ring (1003) and the sixth lip-shaped seal ring (1006) are pressed by the third pressure plate (1004).
6. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 5, wherein: the near shaft ends of the first magnetic conduction plate (502) and the second magnetic conduction plate (1008) are processed into high and low tooth shapes, the gap a between the tooth tops of the low teeth and the rotating shaft (14) is 0.2-0.4 mm, and the gap b between the tooth tops of the high teeth and the rotating shaft is 0.1-0.2 mm.
7. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 5, wherein: the near shaft ends of the first pressing plate (504), the second pressing plate (804) and the third pressing plate (1004) are processed into teeth, and the clearance c between the tooth tops and the rotating shaft (14) is 0.2-0.3 mm;
and inclined grooves are formed in the sides, facing the pressure plate, of the first lip-shaped sealing ring (503), the second lip-shaped sealing ring (506), the third lip-shaped sealing ring (803), the fourth lip-shaped sealing ring (806), the fifth lip-shaped sealing ring (1003) and the sixth lip-shaped sealing ring (1006), and the included angle alpha between each inclined groove and the horizontal plane is 30-45 degrees.
8. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 7, wherein: the near shaft ends of the first pole shoe (508), the second pole shoe (802), the third pole shoe (808) and the fourth pole shoe (1002) are processed into teeth, a sealing gap exists between the tooth-shaped structure and the rotating shaft, and the magnetic liquid (6) is injected into the sealing gap.
9. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 8, wherein: the magnetic liquid sealing device comprises a magnetic circuit formed by a first magnetic conduction plate (502), a first permanent magnet (505), a first pole shoe (508) and a rotating shaft (14), a magnetic circuit formed by a second pole shoe (802), a second permanent magnet (805), a third pole shoe (808) and the rotating shaft (14), and a magnetic circuit formed by a fourth pole shoe (1002), a third permanent magnet (1005), a second magnetic conduction plate (1008) and the rotating shaft (14), so that the magnetic liquid (6) is kept in a sealing gap to form magnetic liquid sealing; the tooth-shaped structures of each magnetic conduction plate and each pressure plate and the rotating shaft (14) form labyrinth seal; each lip seal forms a lip seal with the shaft (14).
10. The magnetic liquid sealing device for the rotary joint of the rotary table refrigeration incubator according to claim 9, wherein: the inclined groove on the lip-shaped sealing ring is used for collecting the magnetic liquid which is thrown out of the sealing gap due to the centrifugal force formed by the rapid rotation of the rotating shaft, so that the magnetic liquid returns to the sealing gap.
CN202010942339.9A 2020-09-09 2020-09-09 Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator Active CN112228655B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101981360A (en) * 2008-03-28 2011-02-23 伊格尔工业股份有限公司 Rotary joint
CN102011912A (en) * 2010-11-19 2011-04-13 太原重工股份有限公司 Rotary three-channel independent transmission joint
WO2013099385A1 (en) * 2011-12-27 2013-07-04 イーグル工業株式会社 Rotary joint
CN103206585A (en) * 2013-04-11 2013-07-17 北京航天控制仪器研究所 Rotary seal joint for turntable thermostat refrigeration
CN104373601A (en) * 2014-10-28 2015-02-25 北京交通大学 Magnetic liquid sealing device with pole shoes being provided with high teeth and low teeth
CN207333706U (en) * 2017-10-17 2018-05-08 北京交通大学 Magnetic liquid-lip packing combination sealing arrangement
CN108953614A (en) * 2018-04-16 2018-12-07 北京交通大学 A kind of magnetic fluid sealing-brush seal set composite

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101981360A (en) * 2008-03-28 2011-02-23 伊格尔工业股份有限公司 Rotary joint
CN102011912A (en) * 2010-11-19 2011-04-13 太原重工股份有限公司 Rotary three-channel independent transmission joint
WO2013099385A1 (en) * 2011-12-27 2013-07-04 イーグル工業株式会社 Rotary joint
CN103206585A (en) * 2013-04-11 2013-07-17 北京航天控制仪器研究所 Rotary seal joint for turntable thermostat refrigeration
CN104373601A (en) * 2014-10-28 2015-02-25 北京交通大学 Magnetic liquid sealing device with pole shoes being provided with high teeth and low teeth
CN207333706U (en) * 2017-10-17 2018-05-08 北京交通大学 Magnetic liquid-lip packing combination sealing arrangement
CN108953614A (en) * 2018-04-16 2018-12-07 北京交通大学 A kind of magnetic fluid sealing-brush seal set composite

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